Are you referring to telling end-users to click "Accept this certificate permanently" box on the certificate warning pop-up? Or is there a software package out there that can do this without the warning pop-up?
In Windoze, if you have a .cer file, and did the use fields correctly when you issued it, the cert will go into the right certificate store automagically. You'd just link to that file somewhere and tell people to "right click, save to desktop, then double-click it there".
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